ident.c

   1 /*
   2  * ident.c
   3  *
   4  * create git identifier lines of the form "name <email> date"
   5  *
   6  * Copyright (C) 2005 Linus Torvalds
   7  */
   8 #include "cache.h"
   9
  10 static char git_default_date[50];
  11
  12 static void copy_gecos(const struct passwd *w, char *name, size_t sz)
  13 {
  14         char *src, *dst;
  15         size_t len, nlen;
  16
  17         nlen = strlen(w->pw_name);
  18
  19         /* Traditionally GECOS field had office phone numbers etc, separated
  20          * with commas.  Also & stands for capitalized form of the login name.
  21          */
  22
  23         for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) {
  24                 int ch = *src;
  25                 if (ch != '&') {
  26                         *dst++ = ch;
  27                         if (ch == 0 || ch == ',')
  28                                 break;
  29                         len++;
  30                         continue;
  31                 }
  32                 if (len + nlen < sz) {
  33                         /* Sorry, Mr. McDonald... */
  34                         *dst++ = toupper(*w->pw_name);
  35                         memcpy(dst, w->pw_name + 1, nlen - 1);
  36                         dst += nlen - 1;
  37                         len += nlen;
  38                 }
  39         }
  40         if (len < sz)
  41                 name[len] = 0;
  42         else
  43                 die("Your parents must have hated you!");
  44
  45 }
  46
  47 static void copy_email(const struct passwd *pw)
  48 {
  49         /*
  50          * Make up a fake email address
  51          * (name + '@' + hostname [+ '.' + domainname])
  52          */
  53         size_t len = strlen(pw->pw_name);
  54         if (len > sizeof(git_default_email)/2)
  55                 die("Your sysadmin must hate you!");
  56         memcpy(git_default_email, pw->pw_name, len);
  57         git_default_email[len++] = '@';
  58         gethostname(git_default_email + len, sizeof(git_default_email) - len);
  59         if (!strchr(git_default_email+len, '.')) {
  60                 struct hostent *he = gethostbyname(git_default_email + len);
  61                 char *domainname;
  62
  63                 len = strlen(git_default_email);
  64                 git_default_email[len++] = '.';
  65                 if (he && (domainname = strchr(he->h_name, '.')))
  66                         strlcpy(git_default_email + len, domainname + 1,
  67                                 sizeof(git_default_email) - len);
  68                 else
  69                         strlcpy(git_default_email + len, "(none)",
  70                                 sizeof(git_default_email) - len);
  71         }
  72 }
  73
  74 static void setup_ident(void)
  75 {
  76         struct passwd *pw = NULL;
  77
  78         /* Get the name ("gecos") */
  79         if (!git_default_name[0]) {
  80                 pw = getpwuid(getuid());
  81                 if (!pw)
  82                         die("You don't exist. Go away!");
  83                 copy_gecos(pw, git_default_name, sizeof(git_default_name));
  84         }
  85
  86         if (!git_default_email[0]) {
  87                 const char *email = getenv("EMAIL");
  88
  89                 if (email && email[0]) {
  90                         strlcpy(git_default_email, email,
  91                                 sizeof(git_default_email));
  92                         user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
  93                 } else {
  94                         if (!pw)
  95                                 pw = getpwuid(getuid());
  96                         if (!pw)
  97                                 die("You don't exist. Go away!");
  98                         copy_email(pw);
  99                 }
 100         }
 101
 102         /* And set the default date */
 103         if (!git_default_date[0])
 104                 datestamp(git_default_date, sizeof(git_default_date));
 105 }
 106
 107 static int add_raw(char *buf, size_t size, int offset, const char *str)
 108 {
 109         size_t len = strlen(str);
 110         if (offset + len > size)
 111                 return size;
 112         memcpy(buf + offset, str, len);
 113         return offset + len;
 114 }
 115
 116 static int crud(unsigned char c)
 117 {
 118         return  c <= 32  ||
 119                 c == '.' ||
 120                 c == ',' ||
 121                 c == ':' ||
 122                 c == ';' ||
 123                 c == '<' ||
 124                 c == '>' ||
 125                 c == '"' ||
 126                 c == '\\' ||
 127                 c == '\'';
 128 }
 129
 130 /*
 131  * Copy over a string to the destination, but avoid special
 132  * characters ('\n', '<' and '>') and remove crud at the end
 133  */
 134 static int copy(char *buf, size_t size, int offset, const char *src)
 135 {
 136         size_t i, len;
 137         unsigned char c;
 138
 139         /* Remove crud from the beginning.. */
 140         while ((c = *src) != 0) {
 141                 if (!crud(c))
 142                         break;
 143                 src++;
 144         }
 145
 146         /* Remove crud from the end.. */
 147         len = strlen(src);
 148         while (len > 0) {
 149                 c = src[len-1];
 150                 if (!crud(c))
 151                         break;
 152                 --len;
 153         }
 154
 155         /*
 156          * Copy the rest to the buffer, but avoid the special
 157          * characters '\n' '<' and '>' that act as delimiters on
 158          * an identification line
 159          */
 160         for (i = 0; i < len; i++) {
 161                 c = *src++;
 162                 switch (c) {
 163                 case '\n': case '<': case '>':
 164                         continue;
 165                 }
 166                 if (offset >= size)
 167                         return size;
 168                 buf[offset++] = c;
 169         }
 170         return offset;
 171 }
 172
 173 static const char *env_hint =
 174 "\n"
 175 "*** Please tell me who you are.\n"
 176 "\n"
 177 "Run\n"
 178 "\n"
 179 "  git config --global user.email \"you@example.com\"\n"
 180 "  git config --global user.name \"Your Name\"\n"
 181 "\n"
 182 "to set your account\'s default identity.\n"
 183 "Omit --global to set the identity only in this repository.\n"
 184 "\n";
 185
 186 const char *fmt_ident(const char *name, const char *email,
 187                       const char *date_str, int flag)
 188 {
 189         static char buffer[1000];
 190         char date[50];
 191         int i;
 192         int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME);
 193         int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME);
 194         int name_addr_only = (flag & IDENT_NO_DATE);
 195
 196         setup_ident();
 197         if (!name)
 198                 name = git_default_name;
 199         if (!email)
 200                 email = git_default_email;
 201
 202         if (!*name) {
 203                 struct passwd *pw;
 204
 205                 if ((warn_on_no_name || error_on_no_name) &&
 206                     name == git_default_name && env_hint) {
 207                         fputs(env_hint, stderr);
 208                         env_hint = NULL; /* warn only once */
 209                 }
 210                 if (error_on_no_name)
 211                         die("empty ident %s <%s> not allowed", name, email);
 212                 pw = getpwuid(getuid());
 213                 if (!pw)
 214                         die("You don't exist. Go away!");
 215                 strlcpy(git_default_name, pw->pw_name,
 216                         sizeof(git_default_name));
 217                 name = git_default_name;
 218         }
 219
 220         strcpy(date, git_default_date);
 221         if (!name_addr_only && date_str && date_str[0]) {
 222                 if (parse_date(date_str, date, sizeof(date)) < 0)
 223                         die("invalid date format: %s", date_str);
 224         }
 225
 226         i = copy(buffer, sizeof(buffer), 0, name);
 227         i = add_raw(buffer, sizeof(buffer), i, " <");
 228         i = copy(buffer, sizeof(buffer), i, email);
 229         if (!name_addr_only) {
 230                 i = add_raw(buffer, sizeof(buffer), i,  "> ");
 231                 i = copy(buffer, sizeof(buffer), i, date);
 232         } else {
 233                 i = add_raw(buffer, sizeof(buffer), i, ">");
 234         }
 235         if (i >= sizeof(buffer))
 236                 die("Impossibly long personal identifier");
 237         buffer[i] = 0;
 238         return buffer;
 239 }
 240
 241 const char *fmt_name(const char *name, const char *email)
 242 {
 243         return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE);
 244 }
 245
 246 const char *git_author_info(int flag)
 247 {
 248         return fmt_ident(getenv("GIT_AUTHOR_NAME"),
 249                          getenv("GIT_AUTHOR_EMAIL"),
 250                          getenv("GIT_AUTHOR_DATE"),
 251                          flag);
 252 }
 253
 254 const char *git_committer_info(int flag)
 255 {
 256         if (getenv("GIT_COMMITTER_NAME"))
 257                 user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 258         if (getenv("GIT_COMMITTER_EMAIL"))
 259                 user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 260         return fmt_ident(getenv("GIT_COMMITTER_NAME"),
 261                          getenv("GIT_COMMITTER_EMAIL"),
 262                          getenv("GIT_COMMITTER_DATE"),
 263                          flag);
 264 }
 265
 266 int user_ident_sufficiently_given(void)
 267 {
 268 #ifndef WINDOWS
 269         return (user_ident_explicitly_given & IDENT_MAIL_GIVEN);
 270 #else
 271         return (user_ident_explicitly_given == IDENT_ALL_GIVEN);
 272 #endif
 273 }